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Note 10 - Line of Credit (Details Textual) - HSBC Venture Bank USA Inc. [Member] - USD ($)
$ in Thousands
33 Months Ended 36 Months Ended
Apr. 07, 2020
Dec. 31, 2022
Mar. 31, 2023
Revolving Credit Facility [Member]      
Line of Credit Facility, Maximum Borrowing Capacity $ 30,000    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.50%    
Proceeds from Lines of Credit, Total   $ 0 $ 0
Revolving Credit Facility [Member] | London Interbank Offered Rate [Member]      
Debt Instrument, Basis Spread on Variable Rate 3.50%    
Line of Credit, Accordion Feature [Member]      
Line of Credit Facility, Maximum Borrowing Capacity $ 20,000